<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>引入css</title>
	-
	<style>

           p{font-size:20px;color:red;}
           #a{
           	font-size:30px;
           	color:gray;
           }
           .txt{
           	font-size:40px;
           	color:blue;
           }
           
           
</style>
</head>
		<p>明天晚上去打桌球有走嘛</p>
		<p>明天晚上去打桌球有走嘛</p>
		<p>明天晚上去打桌球有走嘛</p>
		<p class="txt">明天晚上去打桌球有走嘛</p>
		<p>明天晚上去打桌球有走嘛</p>
		<p id="a">啦啦啦啦啦啦啦</p>
<body>

</body>
</html>
